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1970 Honda CB750K Master Cylinder Assemblies & Parts

Find front master cylinder assemblies, internal rebuild kits and reservoir or hose-junction parts for the 1970 Honda CB750K. Identify the fitted cylinder before selecting internal components, and compare piston size and switch details when considering one of the complete replacement assemblies.

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Currently viewing Master Cylinder & Rebuild Parts

Honda motorcycle parts

Choose your model and year to see parts listed for your bike.

Honda CB750 CB550 CB400F front master cylinder kit 45530-377-305

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-377-305

$37.95 USD
08-0215
Rebuild your early SOHC CB's front master cylinder with this Front Brake Master Cylinder Rebuild Kit, replacing OEM #45530-377-305. Made in Japan. Fits the...
Honda CB750 CB550 CB500 master cylinder rubber boot 45522-300-010

Honda CB Master Cylinder Rubber Boot ~ Replaces 45522-300-010

$9.95 USD
33-0003
Replace your master cylinder rubber boot with this Master Cylinder Rubber Boot, which attaches where the brake hose joins the master cylinder. Replaces OEM...
New
Honda CB750 CB550 CB400F front master cylinder assembly 5 8 in.

Honda CB Front Master Cylinder Assembly ~ 5/8 in.

$99.95 USD
08-0253
Drop in a factory-look master cylinder with a performance piston size using this Front Brake Master Cylinder Assembly. Black body with silver lever, custom-manufactured...
Honda CB750K rear brake light switch spring 35357-300-000

1969-76 Honda CB750K Rear Brake Light Switch Spring ~ Replaces 35357-300-000

$5.95 USD
29-7009
Replace your rear brake stop switch spring with this Rear Brake Light Stop Switch Spring, replacing OEM #35357-300-000.Key Features• Rear brake light stop switch...
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Honda CB900 CB750 CB650 front master cylinder assembly

Honda CB900 / CB750 / CB650 Front Master Cylinder Assembly

$109.95 USD
08-0457
Fit a blacked-out front master cylinder to your late-'70s or early-'80s DOHC CB with this Front Brake Master Cylinder Assembly. Usable on any single...
Honda CB750 CB550 CB400F master cylinder diaphragm 45520-300-000

Honda CB Master Cylinder Reservoir Diaphragm ~ Replaces 45520-300-000

$10.95 USD
08-0282
Replace a hardened or torn master cylinder diaphragm with this Master Cylinder Reservoir Diaphragm, replacing OEM #45520-300-000. Exceptional range of applications, fits FRONT master...
New
Honda CB750 CB550 CB400F front master cylinder assembly 14mm

Honda CB Front Master Cylinder Assembly ~ 14mm

$99.95 USD
08-0269
Restore strong and consistent braking performance with this Front Brake Master Cylinder Assembly, designed as a high-quality replacement for many classic Honda models. This...
Honda CB750K rear brake light switch bracket 50156-300-020

1969-76 Honda CB750K Rear Brake Light Switch Bracket ~ Replaces 50156-300-020

$13.95 USD
73-0887
Replace your rear brake stop switch bracket with this Rear Brake Light Stop Switch Bracket, replacing OEM #50156-300-020.Key Features• Rear brake light stop switch...
Honda CB1000 CB900 master cylinder reservoir cap plastic o-ring 45521-MJ6-006

Honda CB Master Cylinder Reservoir Cap Plastic O-Ring ~ Replaces 45521-MJ6-006

$4.95 USD
29-0062
Replace your master cylinder cap O-ring with this Master Cylinder Reservoir Cap Plastic O-Ring, replacing OEM #45521-MJ6-006.Key Features• Master cylinder reservoir cap O-ring• Plastic•...
Honda CB1100 CB1000 CB900 master cylinder reservoir cap 45513-341-771

Honda CB Master Cylinder Reservoir Cap ~ Replaces 45513-341-771

$39.95 USD
29-0054
Restore your master cylinder cap with this Master Cylinder Cap with Plastic O-Ring, replacing OEM #45513-341-771. This original style was discontinued long ago by...
Universal Honda-type front master cylinder assembly 13mm

Universal Honda-Type Front Master Cylinder Assembly ~ 13mm

$84.95 USD
08-0262
Upgrade to a universal front master cylinder assembly with this Honda-type unit. Complete with lever, banjo bolt, banjo bolt washers, and brake light switch,...
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Honda CB750 CB650 CB550 replacement brake lever for master cylinder

Honda CB Replacement Brake Lever for Master Cylinder 08-0262

$9.95 USD
08-0430
Replace the brake lever on the #08-0262 Master Cylinder Assembly specifically with this Brake Lever. Designed for this particular master cylinder.Key Features• Replacement brake...
Honda CB1100 CB1000 CB900 master cylinder reservoir cap 43513-MJ6-006

Honda CB Master Cylinder Reservoir Cap ~ Replaces 43513-MJ6-006

$23.45 USD
29-0080
Replace your master cylinder reservoir cap with this Master Cylinder Reservoir Cap with Diaphragm, round OEM thread-on type. Cap replaces OEM #43513-MJ6-006, diaphragm replaces...
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Honda CB750 replacement brake lever for master cylinder 08-0253

Replacement Brake Lever for Master Cylinder 08-0253

$9.95 USD
08-0029
Replace the brake lever on the #08-0253 Master Cylinder Assembly specifically with this Brake Lever. Designed for this particular master cylinder, not stock brake...
Magura universal front master cylinder assembly 13mm

Magura Universal Front Master Cylinder Assembly ~ 13mm

$259.00 USD
08-0250
Build a custom front brake setup with this Magura Universal Front Brake Master Cylinder. Features a 13mm piston diameter, 12mm stroke, and a threaded...
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1970 Honda CB750K · Master Cylinder Parts Buying guide

Identify what is fitted before choosing rebuild or replacement

A rebuild kit renews specified internal parts, while a complete cylinder has its own dimensions and design. Reservoir diaphragms, caps and external boots are separate items whose location and application should also be checked.

Compare useful parts

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-377-305 Internal master cylinder kitJapanese-made rebuild kit with the early CB750K application listed.View part Honda CB Master Cylinder Reservoir Diaphragm ~ Replaces 45520-300-000 Reservoir diaphragmReservoir sealing component with front-cylinder applications stated in the product description.View part Honda CB Master Cylinder Rubber Boot ~ Replaces 45522-300-010 Hose connection rubber bootProtective boot described for the brake hose junction at the master cylinder.View part

Related parts: 14mm master cylinder assembly · 5/8-inch master cylinder assembly · Reservoir cap

Compare replacement cylinder specifications explicitly

A similar-looking cylinder can carry a different listed piston size or switch arrangement. The complete assembly descriptions provide those details individually. Compare them with the brake system fitted to your motorcycle and have suitability assessed before choosing an assembly on appearance alone.

Keep a reservoir repair separate from a hose-junction part

The diaphragm is a reservoir component, while the rubber boot description places it where the hose joins the cylinder. Identify the actual part being replaced. Use the product reference and fitted assembly together, then refer to the service manual for required hydraulic work.

Questions that help you choose

Do the complete replacement cylinders have identical specifications?

No. The category includes assemblies with different stated piston sizes, including 14mm and 5/8-inch options. Read the individual cylinder and switch descriptions, then compare them with the brake arrangement fitted to the motorcycle before choosing.

When should the reservoir diaphragm be replaced?

Replace the diaphragm if it is torn, hardened, swollen or unable to seat correctly. Inspect the cap and reservoir sealing surface too. Match the diaphragm to the fitted cylinder; an internal piston rebuild kit and an external reservoir sealing repair address different parts.

Can the hose-junction boot seal the reservoir cap?

No. The boot listing describes the point where the brake hose joins the cylinder. Reservoir diaphragms and cap-related parts have separate listings. Match the actual position and product description before adding the part to your order.

Not sure which part you need?

Send your model and year, plus photos of your existing part and any changes to the original setup.

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